function Map(el) {
    this.el = el
    this.width = 800
    this.height = 400
}

Map.prototype.create = function() {
    this.el.style.width = this.width + 'px'
    this.el.style.height = this.height+ 'px'
    this.el.style.background = 'url(./bg.png)'
    this.el.style.border = '10px solid green'
    this.el.style.position = 'relative'
}